Free developer tool
JSON formatter
Pretty-print or minify JSON with immediate validation. Your data stays in the browser.
Last updated October 31, 2026
How it runs
This tool runs entirely in your browser. Your input is not uploaded or stored.
Developer · runs in your browser
free · no accountFAQs
Does it support comments?+
No. Standard JSON does not allow comments.
Is my JSON uploaded?+
No. Everything runs locally.
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